Books.......I learned from some, got muddled and incorrect information from others. Not good for a newbie who does not know which books can be trusted and which can't. It was a good place to start, but only gave me one perspective; that of the author.
Magazines....better than book to keep current on information.
Internet.....my favorite source of learning. I have access to the top hobbiests, judges, mentors....people who have traveled this road before me and are willing to teach. I have learned many things and made many friends because of the internet.
Shows.....a wonderful way to learn more about this hobby, just by interacting with others and attending the seminars. Volunteering to help work the show is another great way to learn.
Seminars.....the AKCA seminar is a great source of information.
The KHA course....another great source of information.
My own mistakes.....I learned a LOT this way